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A/C faulty

Tiny
LUCKY-ONE
  • MEMBER
  • 1998 CHEVROLET ASTRO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
The A/C system in this van gets really weak or diminishes whenever I approach uphills or freeway up slants. It either slows down blowing cold air until the road gets to even parallel.
Saturday, June 2nd, 2018 AT 3:01 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

This system work on vacuum to keep the blend doors in one position when commanded. Under a load, there is a tank or check valve that should keep the doors in the correct position until you let up on the accelerator. You either have a vacuum leak from a hose or the check valve or tank is leaking.

Check the vacuum lines carefully for any breaks or leaks. If none are found the tank needs to be replaced.

Roy
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Saturday, June 2nd, 2018 AT 3:58 AM

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